Posted on Feb 21, 2020

Daily Challenge #193 - What's the Real Floor?

Setup

Americans can be weird sometimes. The first floor of a building is typically referred to as the ground floor. In some American buildings, there is no 13th floor because of old superstitions.

Implement a function that takes an American floor passed as an integer and returns the actual floor number. Your function should also work for basement floors.

Examples

getRealFloor(1) == 0
getRealFloor(0) == 0
getRealFloor(5) == 4
getRealFloor(15) == 13
getRealFloor(-3) == -3

Tests

getRealFloor(3)
getRealFloor(7)
getRealFloor(20)
getRealFloor(1)
getRealFloor(-6)

Good luck!

This challenge comes from acadet on CodeWars. Thank you to CodeWars, who has licensed redistribution of this challenge under the 2-Clause BSD License!

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Top comments (9)

SavagePixie • Feb 21 '20 • Edited

Elixir

I wasn't sure if the 13th floor thingie was also supposed to apply to basement levels. I wrote a solution that does it.

defmodule Floor do def get_real_floor(n) when n == 0, do: 0 def get_real_floor(n) when n > 13, do: n - 2 def get_real_floor(n) when n > 0, do: n - 1 def get_real_floor(n) when n < -13, do: n + 1 def get_real_floor(n), do: n end

Amin • Feb 21 '20

Elm

getRealFloor : Int -> Int getRealFloor floor = if floor > 12 then floor - 2 -- 15 -> 13 else if floor > 0 then floor - 1 -- 5 -> 4 else floor -- -5 -> -5

Natamo • Feb 22 '20

Same as @savagepixie , not sure about negative superstitions, though I opted not to include it.

static int getRealFloor(int floor) { if(floor > 0 ) { floor--; } if(floor >= 13) { floor--; } return floor; }

Vidit Sarkar • Feb 21 '20

C++ one liner

int getRealFloor(int americanFloor){ // there is no 13th floor because of old superstitions, so no case of 13 and -13 is considered return (americanFloor<1) ? (americanFloor>=-12) ? americanFloor : americanFloor+1 : (americanFloor<=12) ? americanFloor-1 : americanFloor-2; }

Here is what that thing actually is

if(americanFloor < 1){ if(americanFloor >= -12) return americanFloor; else return americanFloor+1; } else{ if(americanFloor <= 12) return americanFloor-1; else return americanFloor-2; }

Rohit Prasad • Feb 21 '20

Python

var = int(input("Enter the floor number: ")) if var <= 0: print(var) elif var > 13: print(var-2) else: print(var-1)

Nijeesh Joshy • Feb 26 '20

Ruby Oneliner

 def getRealFloor floor floor <= 0 ? floor : floor > 13 ? floor - 2 : floor - 1 end

Some tests

 require "test/unit" class GetRealFloorTest < Test::Unit::TestCase def test_get_real_floor assert_equal 0, get_real_floor(0) assert_equal 2, get_real_floor(3) assert_equal 6, get_real_floor(7) assert_equal 18, get_real_floor(20) assert_equal 0, get_real_floor(1) assert_equal -6, get_real_floor(-6) end end #1 tests, 6 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications

Bk Aguilar • Feb 25 '20 • Edited

In JavaScript

 const getRealFloor = n => { return n <= 0 ? n : n > 13 ? n-2 : n-1; }

Jay • Feb 24 '20

Rust pattern matching

fn get_real_floor(n: i32) -> i32 { match n { 0 => 0, 1..=12 => n-1, 13..=std::i32::MAX => n - 2, _ => n } }

Steven Bey • Feb 23 '20

return floor - (floor < 1 ? 0 : floor < 13 ? 1 : 2);